performance vs pianism

performance and pianism both are nouns.

Word	Noun	Adjective	Verb	Adverb
performance	Yes	No	No	No
pianism	Yes	No	No	No

As nouns, pianism is a hyponym of performance; that is, pianism is a word with a more specific, narrower meaning than performance:

performance (noun)	pianism (noun)
the act of performing; of doing something successfully; using knowledge as distinguished from merely possessing it	performance by or technique of a pianist
the act of presenting a play or a piece of music or other entertainment
any recognized accomplishment
a dramatic or musical entertainment
process or manner of functioning or operating